Multiple Choice
Which two ions are most abundant in ocean water?
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2. Atoms & Elements
Ions
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Which ions are present in the compound CaCl2?
A
Ca^{2-} and Cl^{+}
B
Ca^{+} and Cl^{-}
C
Ca^{+} and Cl^{2-}
D
Ca^{2+} and Cl^{-}
Verified step by step guidance1
Identify the elements in the compound CaCl2: calcium (Ca) and chlorine (Cl).
Recall that calcium is an alkaline earth metal, which typically forms a cation with a +2 charge, written as $Ca^{2+}$.
Recognize that chlorine is a halogen, which typically forms an anion with a -1 charge, written as $Cl^{-}$.
Since the formula is CaCl2, there are two chloride ions to balance the +2 charge of one calcium ion, ensuring the compound is electrically neutral.
Therefore, the ions present in CaCl2 are $Ca^{2+}$ and $Cl^{-}$.
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